builtin-diff-stages.c

   1 /*
   2  * Copyright (c) 2005 Junio C Hamano
   3  */
   4
   5 #include "cache.h"
   6 #include "diff.h"
   7 #include "builtin.h"
   8
   9 static struct diff_options diff_options;
  10
  11 static const char diff_stages_usage[] =
  12 "git-diff-stages [<common diff options>] <stage1> <stage2> [<path>...]"
  13 COMMON_DIFF_OPTIONS_HELP;
  14
  15 static void diff_stages(int stage1, int stage2, const char **pathspec)
  16 {
  17         int i = 0;
  18         while (i < active_nr) {
  19                 struct cache_entry *ce, *stages[4] = { NULL, };
  20                 struct cache_entry *one, *two;
  21                 const char *name;
  22                 int len, skip;
  23
  24                 ce = active_cache[i];
  25                 skip = !ce_path_match(ce, pathspec);
  26                 len = ce_namelen(ce);
  27                 name = ce->name;
  28                 for (;;) {
  29                         int stage = ce_stage(ce);
  30                         stages[stage] = ce;
  31                         if (active_nr <= ++i)
  32                                 break;
  33                         ce = active_cache[i];
  34                         if (ce_namelen(ce) != len ||
  35                             memcmp(name, ce->name, len))
  36                                 break;
  37                 }
  38                 one = stages[stage1];
  39                 two = stages[stage2];
  40
  41                 if (skip || (!one && !two))
  42                         continue;
  43                 if (!one)
  44                         diff_addremove(&diff_options, '+', ntohl(two->ce_mode),
  45                                        two->sha1, name, NULL);
  46                 else if (!two)
  47                         diff_addremove(&diff_options, '-', ntohl(one->ce_mode),
  48                                        one->sha1, name, NULL);
  49                 else if (memcmp(one->sha1, two->sha1, 20) ||
  50                          (one->ce_mode != two->ce_mode) ||
  51                          diff_options.find_copies_harder)
  52                         diff_change(&diff_options,
  53                                     ntohl(one->ce_mode), ntohl(two->ce_mode),
  54                                     one->sha1, two->sha1, name, NULL);
  55         }
  56 }
  57
  58 int cmd_diff_stages(int ac, const char **av, const char *prefix)
  59 {
  60         int stage1, stage2;
  61         const char **pathspec = NULL;
  62
  63         git_config(git_default_config); /* no "diff" UI options */
  64         read_cache();
  65         diff_setup(&diff_options);
  66         while (1 < ac && av[1][0] == '-') {
  67                 const char *arg = av[1];
  68                 if (!strcmp(arg, "-r"))
  69                         ; /* as usual */
  70                 else {
  71                         int diff_opt_cnt;
  72                         diff_opt_cnt = diff_opt_parse(&diff_options,
  73                                                       av+1, ac-1);
  74                         if (diff_opt_cnt < 0)
  75                                 usage(diff_stages_usage);
  76                         else if (diff_opt_cnt) {
  77                                 av += diff_opt_cnt;
  78                                 ac -= diff_opt_cnt;
  79                                 continue;
  80                         }
  81                         else
  82                                 usage(diff_stages_usage);
  83                 }
  84                 ac--; av++;
  85         }
  86
  87         if (!diff_options.output_format)
  88                 diff_options.output_format = DIFF_FORMAT_RAW;
  89
  90         if (ac < 3 ||
  91             sscanf(av[1], "%d", &stage1) != 1 ||
  92             ! (0 <= stage1 && stage1 <= 3) ||
  93             sscanf(av[2], "%d", &stage2) != 1 ||
  94             ! (0 <= stage2 && stage2 <= 3))
  95                 usage(diff_stages_usage);
  96
  97         av += 3; /* The rest from av[0] are for paths restriction. */
  98         pathspec = get_pathspec(prefix, av);
  99
 100         if (diff_setup_done(&diff_options) < 0)
 101                 usage(diff_stages_usage);
 102
 103         diff_stages(stage1, stage2, pathspec);
 104         diffcore_std(&diff_options);
 105         diff_flush(&diff_options);
 106         return 0;
 107 }